FLOOD06493

• County: Phillips
• Community: Paoli
• Stream Name: North Fork Frenchman Creek
• Basin: South Platte
• Title: Floodplain/Flood Control Project Feasibility Study
• Date: 9/1/1991
• Prepared For: Phillips County
• Prepared By: Charles F. Leaf, PE
• Floodplain - Doc Type: Floodplain Report/Masterplan

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5

mark" elevations.
Photographs were taken of the study reach of the stream and floodplain
to supports Mannin9s "n" values used for hydraulic computations. Values
for the rou9hness coefficient, "n" were selected for each cross-section.
They were based both on exjsting conditions and post-construction conditions,
as appropriate. The study area was modeled as three separate reaches as follows:
1. Upper Reach from County Road 19 to the U.S. Hi9hway 6 bridge.
2. North Fork Channel between the B.N,R.R. bridge and County Road 23, and
3. South Channel between the U.S. bridge and County Road 23.
Figures I1I-A and I11-B, Appendix III, show flood profiles under
existing conditions (1989 flood) for the Upper Reach, North Fork, and
South Channel respectively. Flood peak water surface elevations for
valley cross-sections 2, 6, 8, and 9 are plotted in Appendix II.